EP3272496B1 - Unite de moulage de recipients, equipee d'un dispositif de boxage a compacite accrue - Google Patents

Unite de moulage de recipients, equipee d'un dispositif de boxage a compacite accrue Download PDF

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Publication number
EP3272496B1
EP3272496B1 EP17305964.3A EP17305964A EP3272496B1 EP 3272496 B1 EP3272496 B1 EP 3272496B1 EP 17305964 A EP17305964 A EP 17305964A EP 3272496 B1 EP3272496 B1 EP 3272496B1
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EP
European Patent Office
Prior art keywords
insert
equal
deployed position
moulding unit
protuberance
Prior art date
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Active
Application number
EP17305964.3A
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German (de)
English (en)
French (fr)
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EP3272496A1 (fr
Inventor
Mikaël DERRIEN
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Sidel Participations SAS
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Sidel Participations SAS
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Publication of EP3272496A1 publication Critical patent/EP3272496A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/48—Moulds
    • B29C49/4802—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/4205—Handling means, e.g. transfer, loading or discharging means
    • B29C49/42069—Means explicitly adapted for transporting blown article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/48—Moulds
    • B29C49/482—Moulds with means for moulding parts of the parisons in an auxiliary cavity, e.g. moulding a handle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/48—Moulds
    • B29C49/4802—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity
    • B29C2049/4807—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity by movable mould parts in the mould halves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/48—Moulds
    • B29C49/4823—Moulds with incorporated heating or cooling means
    • B29C2049/4825—Moulds with incorporated heating or cooling means for cooling moulds or mould parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/48—Moulds
    • B29C49/54—Moulds for undercut articles
    • B29C2049/542—Moulds for undercut articles having means to facilitate the removal of the blow moulded articles
    • B29C2049/546—Moulds for undercut articles having means to facilitate the removal of the blow moulded articles by translatorilly actuating an auxiliary mould part while the mould is still in a closed position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06—Injection blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/48—Moulds
    • B29C49/4823—Moulds with incorporated heating or cooling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/78—Measuring, controlling or regulating
    • B29C49/783—Measuring, controlling or regulating blowing pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B29K2067/003—PET, i.e. poylethylene terephthalate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7158—Bottles

Definitions

  • the invention relates to the forming of containers, in particular bottles, flasks or cans, from blanks made of thermoplastic material (such as polyethylene terephthalate or PET), and more specifically to the forming of containers provided with recessed reserves such as integrated handles.
  • thermoplastic material such as polyethylene terephthalate or PET
  • the manufacture of the containers generally comprises a blowing operation which takes place in a mold whose wall defines a cavity within which is introduced the blank, the latter coming, during blowing, to marry the wall under the effect the high gas pressure prevailing in the blank, previously heated so as to allow its plastic deformation.
  • Some containers may be provided with cavities formed recessed inwardly of the container and made for aesthetic purposes (eg creation of curves) or functional (making a handle for gripping the container).
  • a molding unit with a movable insert initially retracted into the wall of the mold and deployed in the presence of the container being formed in the mold is usually employed to push the material back when it reaches the wall, such as illustrated in the international application WO 2010/063900 (Sidel Participations).
  • One objective is to provide a container molding unit with a recessed reserve, offering a better compactness.
  • the reserve is partially formed by a fixed portion of the mold (the protrusion), it is possible to limit the stroke of the insert, to the benefit of the radial size of the mold.
  • FIG.1 On the FIG.1 is shown, in section and in perspective, a molding unit 1 for forming, from a blank (typically a preform), a container 2 (such as a bottle or a can, as shown in FIG. FIG.13 ) provided with a reserve 3 formed recessed inwardly of the container 2.
  • the container 2 is provided, in a conventional manner, a body 4, a bottom and a neck 2A which opens to the opposite of the bottom.
  • the reserve 3 recessed is a handle formed in the body 4 of the container to facilitate gripping.
  • the body 4 is, at the handle, subdivided into a front portion 4A and a rear portion 4B .
  • part 4A before and part 4B have curved shapes.
  • the rear part 4B is the part that is intended to be housed in the palm of the user when it seizes the container individually.
  • the molding unit 1 comprises, in the first place, a mold 5 provided with a lateral wall 6 which defines a cavity 7 at the impression of a part of the container 2.
  • the cavity 7 is 4 body print of the container 2, the mold 5 further comprising a bottom 8 at the footprint of the bottom of the container 2.
  • the mold 5 is made of metal, for example steel or aluminum (this term also covering aluminum alloys).
  • the cavity 7 (and therefore the container 2 ) extends along a main axis X which defines a vertical direction. Any plane perpendicular to the main X axis is said to be horizontal.
  • the side wall 6 is provided with a housing 9 which opens into the cavity 7.
  • This recess 9 is formed in a hollow protuberance 10 forming a projection towards the inside of the cavity 7 and forming part of the tray against the reserve three hollow defining the handle.
  • each half-mold 5A, 5B is provided with a housing 9s opening in the half-cavity 7A, 7B and hollowed out in a protrusion 10 which protrudes inwardly of the cavity 7.
  • the molding unit 1 comprises secondly, and for each housing 9, a boxing device 11 .
  • boxing designates a technique of local modeling of the material by repoussage by means of a moving part, performed during the forming of the container 2 (and more precisely initiated during the pre-blowing and blowing phases of the container 2 ).
  • Each boxing device 11 comprises an insert 12 of complementary shape to a housing 9 and received therein.
  • Each insert 12 has a front face 13 at the footprint of a local part (that is to say of small relative area) of the container 2, and more precisely the bottom of the reserve 3 recessed.
  • the front face 13 is intended to push the material of the container 2 to complete the footprint of the reserve 3 hollow, as will be explained below.
  • the insert 12 is advantageously made of aluminum.
  • the molding unit 1 is equipped with a pair of boxing devices 11 (preferably symmetrical) whose inserts 12 are placed opposite one another.
  • Each insert 12 is mounted in translation relative to the side wall 6 (that is to say, in the illustrated example, with respect to each half-mold 5A, 5B ) along a transverse axis T between a retracted position ( FIG.6 and FIG.8 ) in which the insert 12 is at least partly retracted in the housing 9, and an extended position ( FIG.7 and FIG.9 ) in which the insert 12 at least partly protrudes into the cavity 7 outside the housing 9.
  • the front face 13 is included in the housing 9 and does not protrude from the protrusion 10, while in extended position of the insert 12, the end face 13 protrudes in the cavity 7 and extends in the extension of the protrusion 10 to complete with it the impression of the reserve 3 formed recessed in the container 2.
  • the front face 13 of the insert 12 in the retracted position of the insert 12, is located projecting from the inner edge of the protrusion 10. According to yet another embodiment, in the retracted position of the insert 12, the front face 13 of the insert 12 is in the extension of the inner edge of the protrusion 10.
  • the insert 12 (as its housing 9 ) has an asymmetrical contour of revolution around the axis T, which blocks the rotation of the insert 12 around it. More specifically, the insert 12 is preferably higher (along the general X axis of the mold 5 ) than wide (in a horizontal plane). In the example illustrated, the insert 12 has an oval contour of major axis substantially vertical.
  • each boxing device 11 furthermore comprises an insert liner 14 mounted in a complementary recess 15 made in the lateral wall 6 (that is to say, in the illustrated example, in each half-case). mold 5A, 5B ) and attached thereto.
  • the liner 14 is advantageously made of steel.
  • Each boxing device 11 further comprises an actuator 16 integral with the insert 12 to move the latter from its retracted position to its extended position, and vice versa, and comprising for this purpose a piston 17 mounted in translation in the sleeve 14.
  • the actuator 16 is preferably made of aluminum.
  • the liner 14 comprises a bottom wall 18 which, when the liner 14 is inserted in its recess 15, is flush with an outer face 19 of the mold 5, and a cylinder 20 which protrudes transversely from the bottom wall 18 and ends with a ledge 21.
  • the liner 14 internally defines a chamber 22 in which the piston 17 is mounted .
  • the liner 14 and the recess 15 receiving it, as well as the piston 17, have an asymmetrical contour of revolution around the liner. transverse T axis, which blocks any rotation of the piston 17 around it, to the benefit of the translational guide accuracy of the insert 12.
  • the sleeve 14, its recess 15 and the piston 17 are, of preferably, higher (along the general X axis of the mold 5 ) than wide (in a horizontal plane).
  • the liner 14, the recess 15 and the piston 17 have an oval contour of substantially vertical major axis.
  • the piston 17 subdivides the chamber 22 into a half-chamber 22A rear and a half-chamber 22B front.
  • the rear half-chamber 22A is internally limited by the piston 17 and externally by the bottom wall 18 of the jacket 14.
  • the front half-chamber 22B is externally limited by the piston 17 and internally by the bottom of the recess 15.
  • the liner 14 is provided, on an outer peripheral face of the cylinder 20, with a rear groove 23 which opens into the rear half chamber 22A through several openings (here in the form of holes) 24 in the liner 14, distributed on the periphery thereof.
  • the liner 14 is provided with two diametrically opposed openings 24 , distributed in this case along a vertical axis.
  • the liner 14 could include an upper number of openings 24 , for example four openings 24 distributed at 90 ° (or differently) around the transverse T- axis.
  • the liner 14 is further provided, on the outer peripheral face of the cylinder 20, with a front groove 25 which opens into the front half-chamber 22B by a plurality of notches 26 formed in the rim 21 and distributed around the periphery of the liner 14. .
  • the jacket 14 is provided with six recesses distributed at about 60 ° about the transverse axis T.
  • Seals 27 mounted on the outer face of the cylinder 20, and compressed between it and the recess 15, seal the grooves 23, 25 relative to each other, and therefore the half-chambers 22A , 22B relative to each other.
  • the liner 14 After being introduced into the recess 15, the liner 14 is attached to the lateral wall 6 of the mold 5. As can be seen in the drawings, and more particularly in the FIG.2 and on the FIG.3 , the liner 14 is fastened to the side wall 6 by means of at least one flange 28 comprising a body 29 fixed to the mold 5 by means of screws 30, and a tongue 31 projecting from the body 29 and resting, by means of Outside, against the bottom wall 18 of the liner 14. In the example illustrated, the liner 14 is fixed to the side wall 6 by means of a pair of flanges 28 mounted on either side, vertically, of the shirt 14.
  • each flange 28 is advantageously housed in a recessed reserve 32 formed complementary manner in the side wall 6 of the mold 5, while the tongue 31 is housed in a recess 33 formed in the bottom wall 18 of the liner 14.
  • the actuator 16 comprises a rod 34 which extends radially projecting from the piston, and on which the insert 12 is fixed, for example by screwing.
  • the insert 12 is fixed on the rod 34 by means of a screw 35 passing through the piston 17 and the rod 34 and coming into helical engagement with a tapped hole 36 made in a rear face 37 of the insert 12, opposite the front face 13 .
  • the insert 12 is advantageously immobilized in rotation relative to the actuator 16 by means of a pin 38 mounted in a hole 39 formed in the rod 34 and a protruding end of which is housed in a hole 40 formed opposite in the rear face 37 of the insert 12.
  • the piston 17 is provided with an attached peripheral segment 41 , in contact with the cylinder 20 and, in addition to the seals 27, provides the watertight partitioning of the two half-chambers 22A, 22B.
  • the segment 41 is advantageously made of a material with a low coefficient of friction, for example bronze or, preferably, polytetrafluoroethylene (PTFE).
  • the recess 15 ends, on the side of the cavity 7, by a partition 42 which separates the recess 15 of the housing 9 and internally delimits the front half-chamber 22B .
  • This partition 42 is pierced with a bore 43 in which the rod 34 of the actuator 16 is mounted in translation, with the interposition of one or more sealing joints 44A which isolate the half-chamber 22B before the housing 9, and preferably also with the interposition of one or more guide rings 44B .
  • the seal 44A is a dynamic lip seal.
  • the ring 44B it can be made of PTFE (polytetrafluoroethylene).
  • Each boxing device 11 comprises a fluidic circuit 45 for controlling the displacement of the piston 17, at least from its retracted position to its deployed position.
  • the fluidic circuit 45 is pneumatic, the fluid used being a gas (typically air) under pressure.
  • Each circuit 45 comprises for this purpose at least one primary fluidic supply conduit 46 of the chamber 22 (and more precisely of the rear half-chamber 22A ) which communicates with the chamber 22 (and more specifically with the rear half-chamber 22A). ) through the openings 24.
  • the primary conduit 46 is pierced in the mold 5 and opens, by an upstream end 47 , on a face 48 upper part of the mold 5 and, by a downstream end 49 , in the recess 15 to the right of the rear groove 23 ( FIG.6 and FIG.7 ).
  • each fluid circuit 45 configured to control also the movement of the piston 17 corresponding to its extended position to its retracted position.
  • each circuit 45 comprises a secondary fluid supply conduit 50 of the front half-chamber 22B , which communicates with the latter through the indentations 26.
  • the secondary duct 50 is pierced in the mold 5 and opens, by an upstream end 51 , on the upper face 48 of the mold 5 and, by a downstream end 52 , in the recess 15 to the right of the groove 25 before.
  • the primary duct 46 is practiced substantially vertically in the lateral wall 6 of the mold 5, whereas the secondary duct 50 is made obliquely (with however a rather weak angle) in the lateral wall 6 of the mold 5.
  • the primary conduit 46 and secondary conduit 50 are shown in bold broken line.
  • the molding unit 1 comprises a pneumatic connection 53 for supplying fluid under pressure from at least the primary conduit 46 .
  • the connector 53 comprises a primary inlet 54 in communication with the upstream end 47 of the primary conduit 46 .
  • This primary inlet 54 is advantageously in the form of a conduit pierced in the connector 53, and which opens into a primary plug 55 (here male type) for connection to a primary hose (not shown) for supplying fluid under pressure. .
  • the primary inlet 54 is, via the primary plug 55 and the primary hose, preferably connected to a source of fluid, typically gas, at high pressure, advantageously greater than 20 bar (and, for example, about 40 bar). It may be the source used for blowing the containers, or else a source of other pressure, generating if necessary a pressure of different value from the source of blowing.
  • a source of fluid typically gas
  • high pressure advantageously greater than 20 bar (and, for example, about 40 bar). It may be the source used for blowing the containers, or else a source of other pressure, generating if necessary a pressure of different value from the source of blowing.
  • the circuit 45 pneumatic comprises a secondary conduit 50 supplying the half chamber 22B before
  • the pneumatic connector 53 comprises a secondary inlet 56 in communication with the upstream end 51 of the secondary conduit 50 .
  • This secondary inlet 56 is advantageously in the form of a conduit pierced in the connector 53, and which opens into a secondary plug 57 (here also of the male type) for connection to a secondary (not shown) fluid supply pipe under pressure.
  • the secondary inlet 56 is, via the secondary plug 57 and the secondary hose, connected to a comparatively lower pressure fluid source, advantageously less than or equal to 12 bars (and, for example, about 7 bars).
  • the ends 47, 51 upstream of the ducts 46, 50 advantageously open in the vicinity of one another, so as to allow their joint connection to the respective sources of fluid under pressure via a single connector 53 mounted on the upper face 48 of the mold 5, as illustrated on the FIG.1 .
  • the connector 53 is fixed on the mold 5 by snapping or, as in the example illustrated on the FIG.1 and on the FIG.10 By means of at least one screw 58.
  • the molding unit 1 comprises a cover 59 mounted on the upper face 48 of the mold 5 and interposed between the latter and the coupling 53.
  • the unit 1 comprises a circuit 60 molding fluid (eg hydraulic.) Of thermal regulation of the wall 6.
  • the fluid used is preferably a liquid, eg. water or oil.
  • This circuit 60 is provided to maintain the temperature of the wall 6 at a substantially constant temperature, ie low (typically of the order of 10 ° C) to ensure cooling of the container 2 just formed, or high (typically the order of 120 ° C) to ensure a heat-setting of the container 2 and thereby increase, thermally, its crystallinity (and therefore its mechanical strength).
  • the fluidic circuit 60 includes channels 61 drilled in the wall 6 of the mold 5 and extends between a feed opening 62 and an outlet opening 63 made in the upper face 48 of the mold 5.
  • the circuit 60 fluidic opens, through the opening 62 of supply and the opening 63 discharge, on the upper face 48 of the mold 5.
  • the channels 61 are drilled so as to bypass the recess 15 and not to cross the conduits 46, 50 of the pneumatic fluid circuit 45 .
  • the unit 1 comprises a connector molding fluid 64 mounted on the upper face 48 of the mold 5 for feeding of the fluid circuit 60 in fresh liquid (or, respectively, warmed) and ensure the evacuation thereof from heated (or cooled) liquid after heat exchange with the wall 6.
  • the fluidic coupling 64 comprises a fluidic inlet 65 (here in the form of a conduit pierced in the connector 64 ) in communication with the feed opening 62 , and a fluidic outlet 66 (here also in the form of a a conduit pierced in the connector 64 ) in communication with the discharge opening 63 .
  • the openings 62, 63 are spaced from each other and open onto the upper face 48 substantially diametrically opposed.
  • the mold 5 comprises a groove 67 cut in the upper face 48 , which extends from an outer end 68 situated in line with the opening 63 discharge, to an inner end 69 in the vicinity of the feed opening 62 .
  • the cover 59 is interposed between the upper face 48 and the fluidic connector 64 .
  • the cover 59 is provided with holes 70 to 73 for placing each connection 53, 64 in communication with its respective circuit 45, 60 .
  • the gas and liquid tightness (typically air and water) of the interface between the cover 59 and the upper face 48 is provided around the ends 47, 51 upstream of the ducts 46, 50 and around openings 62, 63 (and more precisely around the groove 67 ), by means of seals 74 of elastomer, for example silicone or natural or synthetic rubber.
  • the fixing of the cover 59 on the upper face 48 of the mold 5 can, as in the example illustrated, be ensured by means of screws 75.
  • Silentbloc is a French mark of the company HUTCHINSON SA, from which is derived a common name used to designate (see Larousse dictionary, for example) a flexible device for fixing or damping between two elements: the use of the terms “silentbloc” or “silentblocs” in the present application refers to such a device.
  • each silentblock 76, 77 is made of polyurethane, preferably in a polyurethane shade marketed by Trelleborg under the name Zurcon Z20 (registered trademark).
  • This material has the double advantage of a high hardness (to the benefit of the positioning accuracy of the insert 12 ) and good wear resistance, to the benefit of the reliability and durability of the device 11 boxing .
  • each boxing device 11 in each half-mold 5A, 5B is illustrated in FIGS. FIG.2 and FIG.3 .
  • the silentblocs 76, 77 are fixed on the actuator 16 by means of the screws 78; the pin 38 is fitted into the hole 39 and the attachment screw 35 of the insert 12 inserted into the actuator 16 until it projects from the end of the rod 34.
  • the piston 17 is then inserted into the jacket 14 , then the latter, equipped with its seals 27 , is introduced, through the outside of the mold 5 into its recess 15 along the transverse axis T , the rod 34 being inserted into the bore 43.
  • the liner 14 is fixed to the side wall 6 of the mold by means of the flanges 28, which are mounted in their respective reserves 32 and screwed to the side wall 6 .
  • the insert 12 is mounted by the interior of the half-mold 5A, 5B by being introduced into the housing 9 along the transverse axis T to contact with the end of the rod 34, the pin 38 being housed in the hole 40 made in the rear face 37 of the insert 12.
  • the attachment of the insert 12 to the rod 34 is then carried out by means of the screw 35, the tightening of which in the tapped hole 36 is ensured by means of a screwdriver or a suitable key (according to the impression formed in the screw head) passing through an opening 79 made along the axis T in the bottom wall 18 of the jacket 14.
  • the opening 79 is closed in a leaktight manner by means of a cap 80 fitted or screwed into it, as shown in the drawings. FIG.6 to FIG.9 .
  • FIG.11 , FIG.12 and FIG.14 We have illustrated on FIG.11 , FIG.12 and FIG.14 the sizing of the parts of the molding unit 1 making it possible to form the reserve 3 in the container 2.
  • the extensions E, F and F ' are called "maximum" to testify of the case, like the one illustrated on the FIG.11 , where the reserve 3, and the protrusion 10 and the insert 12, do not have symmetry with respect to a vertical plane containing the transverse axis T. This is why the extensions E and F are measured on the side of the insert 12 (respectively on the side of the protrusion 10 ) maximizing their value, as illustrated by FIG. FIG.11 .
  • the protrusion 10 forms part of the counterprint of the reserve 3 recessed in the container 2.
  • the transverse extension F ' of the excrescence 10 is such that it only remains between the projections 10 facing a gap of a width, measured transversely and denoted K, is sufficient to allow, during blowing, the passage, during its expansion, the preform from which the container 2 is formed.
  • This width K is typically of the order of 40 mm.
  • the stroke H of the insert 12 from its retracted position to its deployed position is small, that is to say it is less than or equal to 20 mm. Moreover, this stroke is advantageously greater than or equal to 10 mm.
  • the stroke H of the insert 12 is typically of the order of 15 mm.
  • the cumulative transverse extension F of the protrusion 10 and the insert 12 in the deployed position is such that it persists, in the deployed position of the two inserts 12, a gap between them, so that each hollow reserve 3 is blind. .
  • the handle formed in the container 2 by the two reserves 3 recessed back to back is not through, as illustrated on the FIG.14 .
  • J is the width, measured transversely, of the gap between the inserts 12 facing in the deployed position. This width J is typically of the order of 15 mm, which corresponds to the distance between the two hollow reserves 3 jointly forming the handle of the container 2.
  • the projection formed beyond the protrusion 10 by the insert 12 in the deployed position allows to deepen the reserve 3 despite a low stroke H.
  • the transverse extension E is advantageously greater than or equal to 30% of the cumulative transverse extension F : E ⁇ 0.3 ⁇ F
  • the transverse extension E is preferably less than or equal to 35 mm: E ⁇ 35 mm
  • this transversal extension E is preferably greater than or equal to 10 mm: E ⁇ 10 mm
  • transverse extension E is preferably less than or equal to 45 mm from which the value of the offset I is subtracted: E ⁇ 45 mm - I
  • B is preferably less than or equal to 80% of A: B ⁇ 0.8 ⁇ AT
  • B is preferably greater than or equal to 35% of A : B ⁇ 0.35 ⁇ AT
  • the ratio between the length B of rope and the width C is advantageously less than or equal to 2.3: B ⁇ 2.3 ⁇ C
  • this ratio is advantageously greater than or equal to 1.3: B ⁇ 1.3 ⁇ C
  • the ratio between the rope length B of the projection formed by the insert 12 in the deployed position and its transverse extension E is preferably less than or equal to 3.5: B ⁇ 3.5 ⁇ E
  • this ratio is advantageously greater than or equal to 2.2: B ⁇ 2.2 ⁇ E
  • the length B of rope of the projection formed by the insert 12 in the deployed position is preferably less than or equal to 75 mm: B ⁇ 75 mm
  • the length B of rope of the projection formed by the insert 12 in the deployed position is preferably greater than or equal to 50 mm: B ⁇ 50 mm
  • the ratio of the length A of the rope accumulated to the cumulative transverse extension F is preferably less than or equal to 3.3: AT ⁇ 3.3 ⁇ F
  • this ratio is advantageously greater than or equal to 2: AT ⁇ 2 ⁇ F
  • a blank previously heated to a temperature above the glass transition temperature of its material typically a PET blank, whose glass transition temperature is the order of 80 ° C is heated to a temperature of about 120 ° C.
  • Each insert 12 is then in its retracted position.
  • the mold 5 is then closed again, and a fluid (especially air) under pressure (eg about 7 to 15 bar) is injected into the blank, which is preferably simultaneously stretched by means of a sliding rod.
  • a fluid especially air
  • under pressure eg about 7 to 15 bar
  • the material of the blank is brought into the vicinity of the side wall 6 and the bottom 8 of the mold, but is not intimately applied thereto.
  • FIG.6 and FIG.8 it is possible that, under pressure, the material unfolds somewhat in the housing 9 possibly partially partially partially against the face 13 of the insert 12.
  • Each insert 12 is then moved to its deployed position.
  • a fluid under pressure in this case air at a high pressure, greater than or equal to 20 bars and typically of the order of 40 bars
  • the piston 17 is, with the insert 12 which it is secured, moved transversely towards the cavity 7, until it abuts, through the silentbloc 77 before, against the partition 42, which thus determines the end of travel of the insert 12 in the deployed position.
  • the insert 12 pushes the material in the manner of a punch (but does not perforate it) until it reaches its extended position, the handle then being hollowed out in the body 4 of the container 2 ( FIG.7 and FIG.9 ).
  • the pressure in the container 2 is increased (typically to a value between about 20 and 40 bar) to improve the impression of the container 2 against the side wall 6 and bottom 8 of mold. Since the side wall 6 and the bottom 8 of the mold are thermally regulated, the maintenance of an intimate contact of the material against them promotes the cooling (or, in the case of heat-setting, the heating) of the container 2, the benefit of its mechanical rigidity.
  • the container After a delay (of a few tenths of seconds), the container is depressurized, the mold 5 is opened and the container 2 is removed from the mold 5.
  • the insert 12 is returned to its retracted position before or after the opening of the mold 5.
  • the pressurized fluid is injected via the secondary duct 50 and the front groove 25 into the half-chamber 22B. before, while the fluid present in the rear half-chamber 22A is simultaneously discharged through the groove 23 back, through the conduit 46 primary.
  • the piston 17 Under the pressure difference between the front half-chamber 22B and the rear half-chamber 22A , the piston 17 is, with the insert 12 which it is secured, moved transversely towards the outside of the mold 6, until it abuts , through the rear silentbloc 76 , against the bottom wall 18 which determines the end of travel of the insert 12 in the retracted position.
  • the presence of the insert 14 limits (or eliminates) the wear of the lateral wall 6 of the mold 5, in favor of the reliability of the molding unit 1 .
  • the integration of the fluidic circuit 45 in the mold 5, and more precisely the realization of the conduits 46, 50 of supply in the side wall 6 of the mold 5, with connections made on the upper face 48 thereof limits the transverse bulk of the mold 5 in favor of the overall compactness of the molding unit 1 .
  • the asymmetrical shape (here oval) of the insert 12 and the liner 14 prevents the rotation of the insert 12, in favor of a good impression of the reserve 3 recessed.
  • the preferential uniform distribution of the openings 24 (and indentations 26 ) makes it possible to ensure a good distribution of the pressure in the rear half-chamber 22A (respectively in the front half-chamber 22B ), in favor of the guiding accuracy of the insert 12 and a good impression of the reserve 3 recessed.
  • FIG.15 to FIG.18 an alternative embodiment of the molding unit 1 .
  • the insert 12 is provided with at least one channel 81 which extends from a rear end 82 , through which it opens into the housing 9, at one end 83 through which it opens on the front face 13 .
  • the (or each) channel 81 may be hollowed in the periphery of the insert 12 in the form of a groove (or groove). According to a preferred embodiment illustrated on the FIG.15 to FIG.18 , The (or each) channel 81 is drilled in the mass of the insert 12.
  • the (or each) channel 81 opens onto the rear face 37 of the insert 12.
  • the insert comprises a plurality of channels 81. These channels 81 are advantageously distributed around the rod 34 when it is fixed on the insert 12. In the illustrated example, where the insert 12 is provided with a counterbore 84 in which is nested the rod 34, we see that the channels 81 are distributed around this counterbore 84.
  • the front half-chamber 22B is in fluid communication with the housing 9.
  • the rod 34 is grooved, that is to say it is provided with grooves 85 formed in its outer face parallel to its axis (parallel to the axis T ).
  • These grooves 85 facilitate fluid communication between the front half-chamber 22B and the housing 9.
  • This flow of fluid is carried out during the injection of fluid into the half-chamber 22B before controlling the withdrawal movement of the piston 17 (and therefore of the insert 12 ): a part of the injected fluid leaks into the housing 9 via the grooves 85 and is introduced into the channel (channels) 81 by the rear end 82 to open on the front face 13 by the front end 83 , as illustrated by the arrows in the detail medallion of the FIG.16 .
  • thermoplastic material constituting the container and, secondly, a dilation of the insert 12 which prevents its good sliding in the housing 9.
  • the air gap created between the front face 13 of the insert 12 and the container 2 preserves the shape of the hollow reserve 3 formed in the container 2 by the insert 12 in its deployed position.
  • the low-pressure fluid injection in the front half-chamber 22B (and therefore in the housing 9 ) is carried out before the injection of high-pressure fluid into the rear half-chamber 22A is stopped.
  • the flow of fluid on the front face 13 of the insert 12 therefore begins before the withdrawal thereof. Air circulates therefore between the blown container 2 and the insert 12, and ensures a cooling thereof.
  • the pressure in the container 2 is then released, then the pressure in the rear half chamber 22A is also released.
  • the pressure in the front half chamber 22B is maintained, the insert 12 is moved from its extended position to its retracted position and then the pressure in the front half chamber 22B is released.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
EP17305964.3A 2016-07-21 2017-07-20 Unite de moulage de recipients, equipee d'un dispositif de boxage a compacite accrue Active EP3272496B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1656949A FR3054163B1 (fr) 2016-07-21 2016-07-21 Unite de moulage de recipients, equipee d'un dispositif de boxage a compacite accrue

Publications (2)

Publication Number Publication Date
EP3272496A1 EP3272496A1 (fr) 2018-01-24
EP3272496B1 true EP3272496B1 (fr) 2019-06-26

Family

ID=57121339

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Application Number Title Priority Date Filing Date
EP17305964.3A Active EP3272496B1 (fr) 2016-07-21 2017-07-20 Unite de moulage de recipients, equipee d'un dispositif de boxage a compacite accrue

Country Status (7)

Country Link
US (1) US10518466B2 (es)
EP (1) EP3272496B1 (es)
JP (1) JP6893130B2 (es)
CN (1) CN107639813B (es)
ES (1) ES2742154T3 (es)
FR (1) FR3054163B1 (es)
MX (1) MX2017009440A (es)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3131242B1 (fr) * 2021-12-29 2023-12-08 Sidel Participations Perfectionnement à une unité de moulage équipée d'un insert de boxage mobile

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005110861A1 (ja) * 2004-05-19 2005-11-24 Nissei Asb Machine Co., Ltd. グリッパブルボトルの延伸ブロー成形方法
PL2103413T3 (pl) * 2008-03-18 2012-12-31 Procter & Gamble Sposób wytwarzania w procesie formowania rozdmuchowego pojemnika z integralnie uformowanym uchwytem
FR2936733A1 (fr) * 2008-10-07 2010-04-09 Sidel Participations Perfectionnements au formage des recipients boxes
FR2939070A1 (fr) * 2008-12-03 2010-06-04 Sidel Participations Formage des recipients avec refroidissement localise
FR2939073B1 (fr) * 2008-12-03 2010-12-31 Sidel Participations Formage des recipients avec contre-pression localisee
US9022776B2 (en) * 2013-03-15 2015-05-05 Graham Packaging Company, L.P. Deep grip mechanism within blow mold hanger and related methods and bottles

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
JP6893130B2 (ja) 2021-06-23
US10518466B2 (en) 2019-12-31
CN107639813A (zh) 2018-01-30
CN107639813B (zh) 2021-06-22
FR3054163A1 (fr) 2018-01-26
US20180022008A1 (en) 2018-01-25
JP2018020555A (ja) 2018-02-08
MX2017009440A (es) 2018-09-10
FR3054163B1 (fr) 2018-08-17
ES2742154T3 (es) 2020-02-13
EP3272496A1 (fr) 2018-01-24

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